Sophia W. Hallahan (b. Walworth) (1845-1920) was born in Newstead, New York, and died in Covina, California. In 1863 she married William H. Knight, a railroad engineer. They lived in several locations including Muskegon, Michigan; Chicago, Illinois; Denver, Colorado; and Los Angeles, California. William died in 1892, and in 1900 she married John Hallahan, a conductor with the Southern Pacific railway, in Los Angeles. After his death in 1903 she went to live with her daughter Edith C. Knight in Covina. Hallahan was a lecturer on topics related to domestic science. She was active in the Women's Christian Temperance Union and a charter member of the Friday Morning Club in Los Angeles, California, and the Monday Afternoon Club in Covina. In 1887 Hallahan (then Knight) wrote to Mary Baker Eddy inquiring about Christian Science teachers in her area.

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